SatRadar — Track 10,000+ Active Satellites Live in 3D | Starlink, ISS, GPS

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Free Mac Screensaver

Ten thousand satellites, live

Every Starlink in the mesh, every GPS bird, the ISS, Tiangong, the full GNSS networks, the weather sentinels — drawn from the public TLE catalogs the U.S. Space Force releases through CelesTrak, propagated with the standard SGP4 algorithm.

Sixty frames a second

A custom GPU-side SGP4 propagator holds every satellite smooth while you scrub time, rotate the globe, and zoom from city to constellation in one continuous gesture. Designed to keep ten thousand objects at sixty frames a second on a phone.

Time Travel

A second one-time unlock on iPhone and iPad: scrub the timeline from Sputnik 1 in 1957 through today. Watch the LEO shell ignite as Starlink launches start in 2019. GPS fills in through the 80s and 90s. Every constellation appears on its real birthday.

Live globe

8K Earth texture with OSM map tiles at close zoom. Country borders, day/night terminator with atmospheric scattering, the Sun and Moon in their true positions every frame.

Cinematic screensaver

The free Mac screensaver auto-cycles smooth camera presets — LEO close-ups, the GEO ring, lunar flybys — woven through six decades of orbital history.

Fresh telemetry, every session

Two-line element sets pulled live from CelesTrak. Search any satellite by name or NORAD ID. Filter by constellation, orbit type, or altitude. Tap to track and follow.

Technical details

SGP4/SDP4 propagation on the GPU, the data sources behind every satellite, the shaders that draw the atmosphere, and the accuracy numbers across platforms. Read the technical details →

Unlock Starlink

A one-time purchase on iPhone and iPad opens the full mesh — nearly ten thousand satellites as a living lattice around the planet, the Starlink V2 laser cross-link topology drawn from SpaceX's published mesh design (the live operational link state is not public). Plus OneWeb, Iridium NEXT, and the commercial LEO fleets.

Screenshots

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Ten thousand satellites. Sixty frames a second.

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The full Starlink mesh, in one view.

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From LEO up to the GEO ring at 36,000 km.

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Lock to the ISS. Watch the Earth turn beneath.

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Dawn at orbital speed.

Download

Download SatRadar free on the App Store for iPhone and iPad. Requires iOS 17 or later.

iPhone

iOS 17+ · App Store

Download on the App Store<br>Provide Feedback<br>Free on the App Store.

Download the ZIP, extract it, and double-click the .saver file inside to install. Go to System Settings &rarr; Screen Saver and select SatRadar. The screensaver auto-cycles through cinematic orbital views. Signed and notarized by Apple. Requires macOS 14+ with a Metal-capable GPU.

macOS Screensaver

The space age, one era at a time.

macOS 14+ &middot; Metal required &middot; Free

Download ZIP<br>Provide Feedback<br>Extract, double-click .saver, select in System Settings.

Request access to join the TestFlight beta. You'll receive an email invite with a link to install via the TestFlight app on your Apple TV. Requires tvOS 17+.

Apple TV

tvOS 17+ &middot; TestFlight

Request Access<br>Provide Feedback<br>TestFlight beta. Limited spots available.

macOS App

Coming soon &middot; macOS 14+

Coming Soon — Request Access

Vision Pro

Coming soon &middot; visionOS 2+

Coming Soon — Request Access

Android

Coming 2026

Coming Soon — Request Access

LEO Close-Up

Starlink shells and low-Earth orbit satellites in real time

Built With

Swift 6<br>Metal<br>SwiftUI<br>WebGL2<br>SGP4/SDP4<br>CelesTrak TLEs

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FAQ

Where does the satellite data come from?

All orbital data is sourced from CelesTrak, which aggregates official Two-Line Element (TLE) sets published by the U.S. Space Force. Positions are calculated using the SGP4 orbital propagation algorithm.

How do I install the screensaver?

Download the .zip file, extract it, and double-click the .saver file. macOS will prompt you to install it. Then go to System Settings &rarr; Screen Saver and select "SatRadar". Requires macOS 14+ with a Metal-capable GPU.

How accurate are the satellite positions?

We try really hard — and we're only ever as good as the data we're handed. Every dot is a public Two-Line Element set that CelesTrak relays from the U.S. Space Force, run through SGP4 to get a position. SGP4 is a fast analytical propagator, not a precision tracker, and a TLE ships with no error bars: real accuracy depends on the object, its drag, recent maneuvers, and how stale the TLE is. Rule of thumb — a fresh LEO TLE (a day or two old) lands within a few kilometers of truth and drifts steadily past a week. We refresh the catalog every session. This is v1.0, built for wonder and exploration, not conjunction analysis or aiming your dish. So if you catch a satellite parked somewhere it clearly shouldn't be, that's not us being coy — it's a bug, and we'd genuinely love to hear about it. Tell us what looks off, and check our...